Makefile add scripts target for correctly packaging

Currently scheme lead to path like:
/tmp/makepkg/bees-git/pkg/bees-git/usr/lib/bees/bees

While packaging, so allow do:
make
make scripts
make install ...
make install_scripts ...

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>

scripts/beesd@.service.in

@@ -0,0 +1,24 @@
+[Unit]
+Description=Bees - Best-Effort Extent-Same, a btrfs deduplicator daemon: %i
+After=local-fs.target
+
+[Service]
+Type=simple
+ExecStart=/usr/sbin/beesd %i
+Nice=19
+KillMode=control-group
+KillSignal=SIGTERM
+CPUShares=128
+StartupCPUShares=256
+BlockIOWeight=100
+StartupBlockIOWeight=250
+IOSchedulingClass=idle
+IOSchedulingPriority=7
+CPUSchedulingPolicy=batch
+Nice=19
+Restart=on-abnormal
+CPUAccounting=true
+MemoryAccounting=true
+
+[Install]
+WantedBy=local-fs.target